subprocess出现FileNotFoundError错误

1.问题描述

在使用autogluon库时，出现如下错误（大致上一样，原本的错误已丢失）：

Traceback (most recent call last):
  File "C:/Users/denys/Documents/GitHub/unity_AI/brawlhalla/policy_server.py", line 166, in <module>
    ray.init(log_to_driver=False)
  File "C:\Python\lib\site-packages\ray\_private\client_mode_hook.py", line 105, in wrapper
    return func(*args, **kwargs)
  File "C:\Python\lib\site-packages\ray\worker.py", line 1022, in init
    _global_node = ray.node.Node(
  File "C:\Python\lib\site-packages\ray\node.py", line 301, in __init__
    self.start_ray_processes()
  File "C:\Python\lib\site-packages\ray\node.py", line 1130, in start_ray_processes
    resource_spec = self.get_resource_spec()
  File "C:\Python\lib\site-packages\ray\node.py", line 472, in get_resource_spec
    self._resource_spec = ResourceSpec(
  File "C:\Python\lib\site-packages\ray\_private\resource_spec.py", line 178, in resolve
    num_gpus = _autodetect_num_gpus()
  File "C:\Python\lib\site-packages\ray\_private\resource_spec.py", line 295, in _autodetect_num_gpus
    lines = subprocess.check_output(cmdargs).splitlines()[1:]
  File "C:\Python\lib\subprocess.py", line 415, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "C:\Python\lib\subprocess.py", line 493, in run
    with Popen(*popenargs, **kwargs) as process:
  File "C:\Python\lib\subprocess.py", line 858, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Python\lib\subprocess.py", line 1311, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

2.解决办法

可能是环境变量的问题，在Path中加入：

%SystemRoot%\System32
%SystemRoot%\System32\Wbem
%SystemRoot%\System32\wbem

之后就可能解决。要注意的是，这里已经有C:\Windows\System32，但似乎还不够……